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  • A black compound of manganese reacts with a halogen acid to give greenish yellow gas. When an excess of this gas reacts with NH_{3} an unstable trihalide is formed. In this process the oxidation state of nitrogen changes from ________.

A black compound of manganese reacts with a halogen acid to give greenish yellow gas. When an excess of this gas reacts with NH_{3} an unstable trihalide is formed. In this process the oxidation state of nitrogen changes from _________.

(i) – 3 to +3

(ii) – 3 to 0

(iii) – 3 to +5

(iv) 0 to – 3

Answers (1)

The answer is the option (i). MnO_{2}+4HCl\rightarrow MnCl_{2}+2H_{2}O+Cl (greenish yellow gas)

on reaction of excess of Cl_{2} with NH_{3} we obtained NCl_{3} and HCl.

NH_{3}+3Cl_{2}\rightarrow NCl_{3}+3HCl

O.S. (-3) O.S.(+3)

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